Apparatus for recovering zinc compounds and ammonia.



E. G. @1: M. M. PEARLMAN.

APPARATUS FOR mcovmnw 211x10 ODMPOUNDS AND AMMONIA.

APPLIGATION FILED OUT. 8,1908.

Patented 1 3131227, 1909.

UNITED sTAr sPAT NT ()FEICE.

ELIAS G. PEARLMAN AND MARTIN M. PEARLMAN, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR RECOVERING ZINC, COMPOUNDS AND AMMONIA.

' Specification of Letters Patent.

Patented n n'im, 1909.

Application riled. October 6, 1908. Serial No. 456,429.

To all whom it may concern:

' Be it known that we, ELIAS G. PEARLMAN and MARTIN M. PEARLMAN, both citizens of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have jointly invented certain new and useful Improvements in.Apparatus for Recovering Zinc Com-- offensive in nature, but if freed into the at fumes exist in the said sal-ammonia niosphere are very objectionable, as well as prejudicial to the health of communities. The said valuable gas and fumes it has been found can be utilized by certain treatments to produce commercial roducts, sulfate of ammonia and as zinc-ffydrate or zinc-oxyhydratc. The methods of treatment of such gas and fumes for the prmluction of the aforesaid products, form the subject-matter of an application for Letters Patent filed by us, under date of October 3d, A. l). W08, under the Serial No. 455,948.

The defined pungent or noxious and fluxes or skimniinqs, in varying prr-porthrns; and it is the principal object of our invcntiointo first provide an apparatus in which the said gas and fumes are economically and elliciently conserved by reducing to commercial conditions, respectively, of sulfate of ammonia and zinc oxy-hydrate; and to sccoiulprovide an apparatus in which escape of said valuable gas and fumes into the atmosphere is prevented during roasting or smelting of the said sal-ainmoniac fluxes, hitherto by the practiced methods of roasting'or smelling the same, and givingofl more or less large proportions of said gas and fumes, and which were liberated into the atmosphere to the annoyance of communities due to their poisonous nature and effect upon the throat and lungs. i

The nature and son 0. of our present invention will be more fully understood from the following description taken in connection with the accomlpanying drawing, illustrating diagrammatica y an ap aratus embodying main features of our san invention.

llefcrring to the lrawingt Af'is an 0r(linary'roasting' or smelting, furnace, in which is adapted tohe introduced a batch of salammoniac fluxes 'or-skiminings, by-products of the galvanizing process, in the manufacture of spelter. with a stack a, .which is closed at t e top I). In the side of the stack is provided an opening, in which is introduced a terra-cotta or other suitable conduit 0. be exteriorly covered with asbestos or other material to protect the same against weather conditions. The forward end of the conduit c, is closed and provided with a pipe d, extending therefrom into a chambere type, for injecting in jet-lil e form, steam therethrough. A su ply pi of; is arranged so as to be connecte( with tie device c, and is provided with a cut-off valve f From the device a, extends downward a pipe g, into a vertical closed vessel H, and from which vessel extends a pipe it, into a similar Vessel ll.

In the vessels H and H respectively, if

used in connected series, are laced solutions of quick-lime or calcium hyc rate which are agitated by the steam introduced through the pi e h, along with the ammonia gas and zinc c rlorid fumes from the conduit 0, of the roasting or smelting furnace A, conveyed thereinto and by such combined actions upon the said gas and fumes in each of the vessels ll and ll, is produced therein volatilized chlorid of zinc and volatilized ammonium chlorid or sal-ammoniac due to the saturated solution of calcium-hydrate 0r quick-lime therewith, in each of the said agitated solutions of the'said vessels I-l'and ll. I Through the chlorid of zincreacting with the calcium hydrate therein is produced the following reaction: 4

znc1,+ Ca on znmn cacn.

- the vessel II or H or both connected Vessels,

occurs the following reaction:

2Nl-l,()l Oa(OH) 2Nll,()ll +CaCl vAs, in the above instance, the calcium,

The said furnace is, rovided This conduit may injector device c, preferably of the Schutte-Kortmg Y chloridwill remain as a salt in the vessel H. The ammonia formed by the'above reaction (NI-LOH) is a gas and will ass on into the next vessel H, wherein it ails to undergo any change, as the contents of the vessel H is the same as that of the vessel H, namely calciunr-hydrate. The action in the second vessel I'l serves merely as a safeguard against any incomplete reactions in the first vessel l1, and thus preventing waste of the property of a valuable product to be conserved and utilized underconditions, as above defined.

The ammonia gas as above then passes on through a pipe h into a tank I, partly open at i, and having a depending roof or dome i, extending down into a suitable solution of this tank, preferably, consisting of dilute sulfuric acid, for converting readily the ammonia gas of the solution into sulfate o ammonia, as a commercial product. Such reaction taking place is as follows:

The ammonium sulfate thus formed is a solid and the other formation therein is water. Both of the foregoing commercial products thus obtained being derived in the described manner from the making of the main product spelter by th'roastin or smelting of sa-Lammoniac fluxes or sinnmings and as will be readily understood, other chenncal by-products from the recov cry of ammonia gas and Z1110 chlorid fumes may be obtained, if mixed with other solutions than those hereinbefore described.

The tank I, is provided with an escape pipe i through which any non- )ungent vapors may escape into the atmospliere, after completion of the foregoing operations. By the series of treatments heremabove. described, it will be found as extended practice has demonstrated, that the ammonia gas and chlorid fumes arising from the treatment of the principal material are not fully conserved and utilized, but any vapors liberatedinto the atmosphere, will be odorless and unobjectionable.

In the bottom of each of the vessels H and H, are provided plug valves M, by the operation thereof, permitting the freeing of the zinc hydrate or zinc oxy-hydrate recovered, into ca'rboys or other receptacles 71, for

scribing witnesses.

Vle claim: '1. In an apparatus of the character described, a roasting or smelting furnace having a stack with a closed top and side conduit, a vessel for containing a solution, pipe connections from sald conduit with sald vessel, said pipe connections extending mto and from S tl( vessel to a tank having an escapetreating zinc chlorid fumes and ammonia gas therein from said furnace, substantially as and for the purposes described.

3. In an apparatus of the character described, a roasting or smelting furnace having a stack with a closed top and a side conduit, vertically arranged vessels in connected series, pipe connections from said conduit with one of said connected vessels, an lnjec- I tor-device located in the pipe connections between said conduit and one of said vessels, an outlet from the last of said vessels to an open tank having a dome and an escape-pipe, said connected vessels and tank adapted to contain, respectively, different solutlons for receiving zinc chlorid fumes and ammonia gas from said roasting furnace, said connected vessels provided with means to permit of discharge of the recovered product and said tank arranged to permit of not only esca e of non-pungent vapors but the recovery 0 the by-product of said tank, substantially as and for the purposes described.

In witness whereof, we have hereunto set our signatures in the presence of two sub- ELIAS e. PEARLMAN.

MARTIN M. PEARLMAN.

Witnesses: I

J. WALTER DOUGLASS, TnoMAs M. SMITH.

ion 

